Method of variable target idle speed control for an engine
First Claim
Patent Images
1. A method of controlling the idle speed of an internal combustion engine having sensors for monitoring predetermined conditions such as engine coolant temperature, engine RPM, and battery voltage, said method comprising the steps of:
- sensing predetermined conditions of an internal combustion engine by a plurality of sensors;
determining if the predetermined conditions have been met by signals from the sensors;
disabling control of variable target idle speed if the predetermined conditions have not been met;
enabling control of variable target idle speed if the predetermined conditions have been met;
varying the target idle speed between predetermined minimum and maximum values; and
controlling an idle speed air bypass valve based on the target idle speed to control the idle speed of the internal combustion engine.
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Abstract
A method of controlling the target idle speed of an internal combustion engine having sensors for monitoring engine coolant temperature, engine speed, and battery voltage.
52 Citations
20 Claims
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1. A method of controlling the idle speed of an internal combustion engine having sensors for monitoring predetermined conditions such as engine coolant temperature, engine RPM, and battery voltage, said method comprising the steps of:
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sensing predetermined conditions of an internal combustion engine by a plurality of sensors; determining if the predetermined conditions have been met by signals from the sensors; disabling control of variable target idle speed if the predetermined conditions have not been met; enabling control of variable target idle speed if the predetermined conditions have been met; varying the target idle speed between predetermined minimum and maximum values; and controlling an idle speed air bypass valve based on the target idle speed to control the idle speed of the internal combustion engine.
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2. A method of controlling an idle speed of an internal combustion engine having sensors for monitoring predetermined conditions such as engine coolant temperature, engine rotational speed, battery voltage, battery temperature, throttle position, ambient air temperature, and transmission status, said method comprising the steps of:
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sensing the predetermined conditions of the internal combustion engine by a plurality of sensors; determining if predetermined conditions have been met by evaluating signals from the sensors; sensing if a shift of the transmission has been completed; comparing the engine coolant temperature with a predetermined value; comparing the battery and/or environmental ambient air temperature with a predetermined value; implementing a delay timer for the variable target idle speed controller; determining if the battery voltage is within one of a plurality of different ranges; increasing or decreasing the target idle speed between a maximum and minimum value by a predetermined amount based on the range of the battery voltage; and controlling an idle speed air bypass valve based on the target idle speed to control the idle speed of the internal combustion engine. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling an idle speed of an internal combustion engine by a control system having an electronic control unit and sensors for monitoring engine coolant temperature, engine RPM, and battery voltage for the engine, said method comprising the steps of:
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sensing engine coolant temperature by a sensor; determining a target idle speed based on the sensed engine coolant temperature; sensing predetermined conditions of the engine by a plurality of sensors; determining if the predetermined conditions have been met; sensing battery voltage; determining if the battery voltage is within one of a plurality of different ranges; increasing or decreasing the target idle speed between a maximum and minimum value by a predetermined amount based on the range of the battery voltage; and controlling an idle speed air bypass valve based on the target idle speed to control the idle speed of the internal combustion engine. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification